<template>
  <div>
    角度：<input v-model="selectedAngle"></input><br>
    <div>
      <a-input-number
        :default-value="100"
        :min="0"
        :max="100"
        :formatter="value => `${value}%`"
        :parser="value => value.replace('%', '')"
        @change="onChange"
      />
    </div>
    <canvas ref="canvas" @mousemove="handleMouseMove" @click="handleClick"></canvas>
  </div>
</template>

<script>
  export default {
    name:"AngleSelecd",
    mounted() {
      this.canvas = this.$refs.canvas;
      this.context = this.canvas.getContext("2d");
      this.selectedAngle = 0;
      this.drawDashboard();
    },
    methods: {
      onChange(value) {
        console.log('changed', value);
        this.value=value
        this.selectedAngle=this.value

      },
      drawDashboard() {
        const centerX = this.canvas.width / 2;
        const centerY = this.canvas.height / 2;
        const radius = Math.min(centerX, centerY) - 10;

        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);

        // 绘制仪表盘背景
        this.context.beginPath();
        this.context.arc(centerX, centerY, radius, 0, 2 * Math.PI);
        this.context.fillStyle = "lightgray";
        this.context.fill();

        // 绘制角度标记
        this.context.font = "12px Arial";
        this.context.fillStyle = "black";
        this.context.textAlign = "center";
        this.context.textBaseline = "middle";
        for (let angle = 0; angle < 360; angle += 30) {
          const angleRad = angle * (Math.PI / 180);
          const markerX = centerX + (radius - 10) * Math.cos(angleRad);
          const markerY = centerY - (radius - 10) * Math.sin(angleRad);
          this.context.fillText(angle.toString(), markerX, markerY);
        }

        // 绘制指针
        const angle = this.selectedAngle * (Math.PI / 180);
        const pointerLength = radius * 0.8;
        const pointerX = centerX + pointerLength * Math.cos(angle);
        const pointerY = centerY - pointerLength * Math.sin(angle);

        this.context.beginPath();
        this.context.moveTo(centerX, centerY);
        this.context.lineTo(pointerX, pointerY);
        this.context.lineWidth = 2;
        this.context.strokeStyle = "red";
        this.context.stroke();

        // 打印选中角度
        this.context.font = "16px Arial";
        this.context.fillStyle = "black";
        this.context.fillText(`Selected    Angle: ${this.selectedAngle}°`, 10, 20);
      },
      handleClick(event) {
        this.updateSelectedAngle(event);
      },
      handleMouseMove(event) {
        if (event.buttons === 1) {
          this.updateSelectedAngle(event);
        }
      },
      updateSelectedAngle(event) {
        const rect = this.canvas.getBoundingClientRect();
        const x = event.clientX - rect.left;
        const y = event.clientY - rect.top;
        const centerX = this.canvas.width / 2;
        const centerY = this.canvas.height / 2;

        // 计算选中角度
        const angle = Math.atan2(centerY - y, x - centerX);
        let selectedAngle = (angle * 180) / Math.PI;
        if (selectedAngle < 0) {
          selectedAngle += 360;
        }

        this.selectedAngle = Math.round(selectedAngle);
        this.increaseCounter()
        this.drawDashboard();
      },
      increaseCounter() {
        console.log("实时发送数据：",this.selectedAngle)
        this.$emit("counter-updated", this.selectedAngle);
      },
    },
    data() {
      return {
        timer:null,
        canvas: null,
        context: null,
        selectedAngle: 0,
        value:null
      };
    },
    watch: {
      selectedAngle(newValue) {
        this.drawDashboard();
        this.increaseCounter()
        this.onChange(newValue)
      },
    }
  };
</script>
